Grinder.



lF'. H. HALSTEAD.

GRINDER.

APPLICATION FILED MAR. 12| 1918.

Patented Apr. 8, 1919.

6 SHEETS-SHEET 2 mwenmr g @demis .Hwsad.

. H. HALSTEAD.

GRINDER.

AEPLICATION FILED MAR. l2, ma.

lll/ w.. L 5

IAX

E. H. HALSTEAD.

GRINDER.

APPLICATION FILED MAR. 142.1918.

PatentedAp. 8, 1919.

5 SHEETS-SHEET 4 .Pmnfed Apr. 8,1919,

@SHEETS-SHEET 5.

F. H. HALSTEAU.

GRINDER.

APPLICATION FILED MAR.12, 1918..

gggggple V Patented Apr. 8,1919.A

awww.,

E SHEETS-SHEET 6.

FREDERICK H. HALSTEAD, OF BOSTON, MASSACHUSETTS, ASSIGNOR- TO RIVET LATHE AND GRINDER COMPANY, OF FANEUIL, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

GRINDER.

Specification of Letters Patent.

)Patented Apr. 8, 1919.

Application led March 12, 191.8. Serial No. 221,954.

This invention pertains to improvements i in grinders, and more particularly, though not exclusively, to improvements in machines and mechanisms adapted for grinding surfaces curved in two dimensions, such as the internal and external races of ball bearings, the races of thrust ball bearings, and spherical surfaces such as the balls and sockets of ball and socket joints. The illustrative machine/selected as a preferred embodiment of myk invention is in many respects similarvr to the machine shown in my co-pending application Serial No. 130.062, filed November 7, 1916.

Referring to the drawings Figure 1 shows a side elevation of a preferred embodiment constituting one illustrative form of my invention;

Fig. 2 is a plan view7 of the lower portions of the machine with the top thereof removed; l

Fig. 3 is a vertical longitudinal section on the line 8 3 of Fig. 2;

Fig. L is a side elevation on an enlarged scale, showing the detail of a portion of the feed mechanism shown in Fig. 1;

Fig. 5 is a section on the line 5-5 of Fig. 4.-; and

Fig. 6 is an elevation, partly broken away, taken from the left of Fig. 1 and showing details of a preferred form of reverse mechanism.

Referring to Fig. 1, in the illustrative embodiment of my invention i have shown an oscillating grinder comprising a base 7 having mounted thereon an oscillatory support 8 for a work spindle 9 carrying any suitable chuck 10 and adapted to 'coperate with the grinding wheel 11 mounted on the grinding wheel shaft 12 rotatable in the bearing 13. yEhe tool support 14 is preferably, as shown, carried by a slide 15, similar to that shown and described in my co-pending application' above mentioned, the slide 15 being 1n turn carried on a feed slidel and adapted to be fed relative thereto by feed mechanism which may resemble thatshown in my copending application above mentioned.

Refenrin now to Fig. 2, the oscillatory post 17, whlch carries the oscillatory support shown in Fig. 1, preferably carries a worm gear 18 adapted to be alternately engaged on alternate sides by driving worms 19, 20 turning in the same direction but adapted to eni gage the worm gear 18 on opposite sides thereof and hence to impart oscillatory movement thereto in opposite directions. The worms 19, 20 are preferably carried in an oscillatory worm cage 21 adapted t9 be shifted to and fro by reverse mechanism hereinafter more fully described. The worm cage 21 shifts only at the periods of reversal of the machine, and for this reason l prefer to utilize the movement of this cage to actuate feeding movement of the feed slide 15 and parts carried thereby. To this end` I have provided an arm 22 connected at its outer end by a link 23, to a toggle (Fig. 5) comprising an upper toggle member 2li connected to a stationary portion of the frame of the machine and a lower toggle member 25 connected at 26 to a lever 2'? adapted to impart reciprocatory movement to the pawl-carrying rod 28 of the feed mechanism. The details of the feed mechanism, except for the parts 22, 23, 24.-, 25 and 27 .hereinbefore described, are substantially the same as those shown and described in my co-pending application above referred to, and for this reason' a detailed descripl tion thereof is unnecessary. The arm 22 and link 23 are so proportioned 'and positioned relative to the toggle members 24, 25 that said toggle is in its straightened position when the shiftableA actuator therefor, herein shown as the worm cage 21, is in its central position. Therefore, each time that the worm cage is shifted, the toggle 24, 25 will be shifted from Hex pition on one side of the center past its center or straightened position to a correspondingly flexed position on the opposite side of its center thereb rocking the lever 27. which through the a justing screw 29 actuates movement' of thel feed mechanism.

ln my (zo-pending application before mentioned, provide means controlled by the feed mechanism for automatically stopping relative traverse of the work and tool when the feeding movement has progressed Mld to a predetermined point. ln the present invention l provide such mechanism in improved form, herein comprising (Fig. 2) a slidin bolt 30 guided in a bearing 3l carried y the :trame of the machine, and adapted to engage a latch portion 32 carried by a shiftable element, herein shown as the worm cage 21. lThe bolt 30 is constantly urged into locked relation with the latch 32 by a spring 33, but is held out et' engagement with the same during the operation of the machine b v a forked arm 34 engaging the bolt 30 and' connected to a shaft 35`carrying the lip 36 adapted to be engaged by a catch 37 on a lever 38 fulcrumed at 39 to the frame of the machine and adapted to be rocked by the screw i() ot the feedreducing lever -l-l, which corresponds to the feed-reducing lever 107 in my copending application. When the lever il has been sufficiently elevated to rock the lever 33 to release the lip 36 from the catch 37, the spring 33 will pull the bolt 30 forwardly into position to engage the latch 32. l't the Worm cage is rocked to its extreme lett position7 as shown in Fig. 2, the bolt 30 .will not immediately stop the relative traverse of the Work and tool b v holding the worm cage in central position with both worms out of engagement with the worm gear 18. but will permit one more relative traverse of the Work and tool so that the latch 32 is at the right (as viewed in Fig. 2) of the bolt 30, after which, at the next period of reversal, the latch 32 will catch against the bolt 30, thereby holding the Worm cage in central position and stopping the machine with the Work facing 'the operator in convenient position for gaging of the work and removal thcreotl from the Work chuck. If it is desired to start the machine in operation again, the feed must be turned bach an amount corresponding to the additional amount of stock which it is desired to remove, after which the hand lever on the shaft 35 may be de )ressed until the lip 36 engages the catch 34. rlhis operation will cause the arm 34 to engage the pins 42 projecting from the bolt 30 and result in the removal of the bolt from behind the catch 32, thereby ireein the Worm cage and permitting it to be shifted to the position shown in Fig. 2 by the operation of reverse mechanism hereinafter described.

In the preferred form ot my invention shown in the dravvings,- have provided a reverse mechanism which performs the same functions as that shown and described in my copending application, but which is somewhat simpler in operation and semewhat easier to adjust. Referring to Fig. 6 I have shown tappets 50 and 5l carried by the oscillatory support'S and adapted alternately to strike against and rock a lever 52 fulcrumed at 53 and connected et 54: te

Leserin a sliding element 55 carrying cams 53 and 57 adapted to rock levers 58 and 59 engaging respectively plungers G0 and (5l slidably carried in a bored portion of the .projecting end 62 ot the Worm cage 21. The plungers G() and Gl are urged apart by a spring 63 interposed between them. The top oi the projecting end 62 of the worm cage 2l. carries latch-engaging portions 64 and 65 adapted to be engaged by latches 66 and 67 fulcrumed on a stationary portion of the machine and connected to levers 68 and 69 urged outwardly by springs '70 and 7l so that the tendency of the latches 66 and 67 is to engage the latch-engaging portions 64 and 65. lVhenthe reverse mechanism is in the position shoivn in Fig. 6, the moving part to be reversed, herein typified by an oscillatory table 8, is moving from left to right as viewed in Fig. (3, and the tappet 50 has engaged the lever 52 and has moved the same a suiiicient dist-ance to shittthe cam 5C to the right. thereby rocking the lever 53 and partially loading the spring 63 carried by the extension of the shifting ment G2. Vhen the tappet 50 has shifted the lever 52 still farther to the right, the cam 5G ivill rock the lever 58 still farther, thereby giving more compression to the spring (33. after which the pin Z2 connected to the lever52 will engage the face 73 of a latch-tripping slide 75. thereby shifting the same to the right until the screiv engages the bell crank 68, thereby disengaging the latch 66 and permitting the spring 63 to shift the shiftable element'62 to the right, thus reversing the driving connections while permitting the latch 67 to engage the latch-engaging portion G5 to hold the shittable element firmly in its extreme righthand position. rl`he parts will remain in this position until the movement of the tappet 5L to the left engages the lever 52 and moves it to the left sufficiently Ato cause the reverse mechanism to function in the saine manner previously described, but in the opposite direction.

While l have shown and described a preterred form of' one embodiment of my invention, it will be understood that major changes involving omission, substitution,

les

alteration and reversal of parts, and even tappet` means" carried bythe moving support,

lever .means for engagement by said tappet means, cam means movable by said lever means, and operative connections above said cam means for transmitting power therefrom to shift said shiftable element.

' ,2. In a grinder having a Work support, a tool support and traversing means for mov# ing one of said supports relative to the other, said traversing means including a shitable element; reverse means `for said traversing means comprising, in combination, tappet means carried-bythe moving support, lever means for engagement by said tappet means,

rectilinearly slidablecam means movable by said lever means, and operative connections above said cam means for transmitting power therefrom to shift said shiftable element.

3. In a grinder having awork support, a

l tool support and traversing means for one of said supports; said traversing means including a shiftable element, reverse means comprising, in combination, lever means .shiftable by said traversing means and operatively controlling energy-storing means to shift said shiftable element and latch means for restraining and releasing said energystoring means, said latch means being alternately disengageable by said lever.

el. ln a grinder having aY Work carrier and a tool carrier and means Jfor traversing able cage, a

means carrying oppositely oneof said carriers relative to the other, feed 3o mechanism, driving means including a shiftlatch carried by said cage and a bolt controlled by said feed 'mechanism for engaging said latch and holding said cage in central position, thereby to discontinue 35 relative traverseof the Work carrier and tool carrier. p y

5. lna grinder; having a work lcarrier and a tool carrier and means for traversing one of said carriers relative to the other, feed te mechanism, driving means including pivoted A effective drivin elements and means controlled by said mechanism` for engaging saidpivoted means at a point adjacent that portion thereof hav-' 45 ing the greatest movement, andfor stopping, said pivoted means With'said driving elements in inoperative position.

6. In a grinder, a work carrier, a tool carrier, traversing v `means for traversing one eo of said .carriers relative to the other, and feed mechanism cordinately controlled with said traversing means and including a pawl and toggle mechanism for imparting movement to saidpavvl.- y 55 In testimony whereof, l have signed my name to this specification.

FREDERICK H. HALSTEAD. 

